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PHP SPL标准库之数据结构栈(SplStack)介绍,splsplstack

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Release: 2016-06-13 09:04:37
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PHP SPL标准库之数据结构栈(SplStack)介绍,splsplstack

栈(Stack)是一种特殊的线性表,因为它只能在线性表的一端进行插入或删除元素(即进栈和出栈)

SplStack就是继承双链表(SplDoublyLinkedList)实现栈。

类摘要如下:

简单使用如下:

//把栈想象成一个颠倒的数组 $stack = new SplStack(); /** * 可见栈和双链表的区别就是IteratorMode改变了而已,栈的IteratorMode只能为: * (1)SplDoublyLinkedList::IT_MODE_LIFO | SplDoublyLinkedList::IT_MODE_KEEP (默认值,迭代后数据保存) * (2)SplDoublyLinkedList::IT_MODE_LIFO | SplDoublyLinkedList::IT_MODE_DELETE (迭代后数据删除) */ $stack->setIteratorMode(SplDoublyLinkedList::IT_MODE_LIFO | SplDoublyLinkedList::IT_MODE_DELETE); $stack->push('a'); $stack->push('b'); $stack->push('c'); $stack->pop(); //出栈 $stack->offsetSet(0, 'first');//index 为0的是最后一个元素 foreach($stack as $item) { echo $item . PHP_EOL; // first a } print_R($stack); //测试IteratorMode
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